You boil water if you have no container? Always wondered about this. Probably why I find some way to always pack at least a metal cup. I know how to improvise a filter system but that is not as sure as boiling. Any ideas?
Believe it or not Bill, but aluminum foil can make a pretty good pot to boil water in. I was a "non-believer" until I tried it.
Tin foil pot for boiling water
